AI coding cost

AI Coding Agent Cost Calculator

Estimate monthly pay-as-you-go cost for agentic coding work, compare it with subscription tiers, and decide when to move from light use to a larger plan.

Claude API estimate $0.00

Codex credits 0.0

Updated May 19, 2026

Coding agent sessions per month

Average input tokens per session

Average output tokens per session

Cached input share (%)

Optional agent runtime hours per session

Claude API model assumption

Codex model assumption

Monthly Codex credit budget

Your monthly estimate

Claude API $0.00

Codex credits 0.0

Total tokens 0M

Claude model: Claude Sonnet
Codex model: GPT-5.3 Codex
Runtime add-on: $0.00
Claude cache savings: $0.00

Based on the current defaults, compare the monthly estimate with the plans you already pay for before buying another coding subscription.

Claude Pro $20 Claude Max $100/$200 Cursor plans vary Codex credits vary by model

How to use this calculator

Start with your real monthly coding pattern. A large monorepo agent session can use far more context than a short bug fix, so adjust input tokens and output tokens instead of relying on a single default.

If the pay-as-you-go estimate is near a subscription price, compare subscriptions first. If the estimate is low or spiky, pay-as-you-go with spend limits may be simpler.

What this does not know

This tool cannot see your account quota, hidden provider-side caching, prompt compression, or plan-specific fair-use windows. Treat every number as a planning estimate and confirm with each product's billing or usage dashboard.

Source notes

Anthropic pricing for Claude API input, cached input, output, and runtime assumptions.
OpenAI Codex rate card for Codex credit estimates by model.
Cursor pricing for plan comparison context.
Prices and product rules change. Edit the inputs before making a purchase decision.